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How many seconds will it take for a car that is traveling at

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How many seconds will it take for a car that is traveling at [#permalink]

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New post 30 Nov 2008, 07:18
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Hi, everybody!

the q looks easy, but i can not come to the OA stated in the test. Hope, you gonna be more lucky

How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1 mile = 1,160 yards)

A. 8
B. 9
C. 10
D. 11
E. 12

Kudos [?]: 3 [0], given: 0

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Joined: 23 Nov 2008
Posts: 79

Kudos [?]: 57 [0], given: 0

Re: looks easy, but [#permalink]

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New post 30 Nov 2008, 07:27
Should be < 2 secs - perhaps the question is wrong?

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Re: looks easy, but [#permalink]

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New post 30 Nov 2008, 07:59
Yes, this question is not correct. For those that are not used to using anything but meters, the 1 mil = 1160 yards is not correct. 1 mile = 5280 feet. 1 yard = 3 feet. 5280 / 3 = 1760 yards per mile, not 1160.

At 45 miles per hour, the car will go 45 miles in 1 hour (yeah, i know that's obvious...but still).

to go 1 mile, this is 1/45 of the distance in an hour and 1/45 of the time. so 1/45 * 60 = number of minutes to go that 1 mile.

60 / 45 = \(1\frac{1}{3}\) minutes, or 1 min. 20 seconds to go 1 mile. (1 min 20 seconds = 80 seconds)

r * t = distance

r = 80 seconds per mile Since the question asks for seconds, lets turn this into seconds.

t = unknown

distance = 22 yards

Now set up the simple comparison equation:

\(\frac{22}{1760} = \frac{x}{80}\)

To eliminate the fractions, cross multiple (22 * 80) and (1760 * x)

1760x = 1760

x = 1

Rice wrote:
Hi, everybody!

the q looks easy, but i can not come to the OA stated in the test. Hope, you gonna be more lucky

How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 22 yards? (1 mile = 1,160 yards)

A. 8
B. 9
C. 10
D. 11
E. 12

_________________

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J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

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Last edited by jallenmorris on 30 Nov 2008, 11:56, edited 1 time in total.

Kudos [?]: 617 [0], given: 32

Intern
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Joined: 08 Oct 2007
Posts: 33

Kudos [?]: 3 [0], given: 0

Re: looks easy, but [#permalink]

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New post 30 Nov 2008, 08:41
Thank you all. It really confused me. Now I know smth wrong with the q

Kudos [?]: 3 [0], given: 0

Re: looks easy, but   [#permalink] 30 Nov 2008, 08:41
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